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Finding the Fourth Proportional to 117.01, 161.40 and 87.81

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Solution

The fourth proportional to 117.01, 161.40 and 87.81 is: 121.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    117.01 : 161.40 = 87.81 : x
  2. Step 2: Convert to fraction form
    117.01/161.40 = 87.81/x
  3. Step 3: Cross multiply
    117.01x = 161.40 × 87.81
  4. Step 4: Simplify right side
    117.01x = 14,172.53
  5. Step 5: Solve for x
    x = 14,172.53/117.01
  6. Step 6: Final answer
    x = 121.12

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.